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You want to stay pretty close to the Official Guide. In my classes I use the OG and the OG Workbooks. The Manhattan Quant books are quite good (individual books for specific skills). For nonnative speakers I do not at all recommend the Manhattan Sentence Correction book. It's too complex for nonnative speakers. I like the Manhattan Critical Reasoning book a lot, too.
1- GMAC and MBA.COM
2- APPS LIKE ( READY 4 GMAT , GMAT CLUB, GMAT PREP, GEMAT FOR DUMMIES
3- LOTS OF STUDYING FROM GMAT OFFICIAL BOOK (VERBAL, QUANTITATIVE)
4- GMAT PREP FROM GMAC
5- INVEST IN EXAMS NOT IN COURSES
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